Rolling-mill with supported working rolls



I A. KRIWAN.

ROLLING MILL WITH SUPPORTED WORKING ROLLS.

APPLICATION FILED DEC|Z8, I916.

Patented Nov. 30, 1920;

5 SHEETS-SHEET h .ZFwerzZZr A. KRIWAN. ROLLING-MILL WITH SUPPORTEDWORKING ROLLS. APPLICATION FILED DEC-28, l9l6.

1,360,959. Patented Nov. 30, 1920.

5 SHEETSSHEET 2- A. KRIWAN.

ROLLING MILL WITH SUPPORTED WORKING ROLLS.

- APPLICATION FILED DEC-28. 1916.

1,360,959. Patented Nov. 30,

' Jnvpnlor .flrzzold 115i wast KRIWAN.

R0 LL| NG MI SUPPORTED WORKING ROLLS. APPLICAT DN FILED DEC-28, 1916.

1,360,959. Patented Nov. 30, 1920..

' 5 SSSSSSSSS EH 4- 7 Jul/ 07x231,

\i'if J2 ololffrcwaw, j 8 y K Caz 2 A. KRIWAN.

ROLLING MILL WITH SUPPORTED WORKING ROLLS.

APPLICATION FILED DEC.2B, 1916- 1,360,959, Patented Nov. 30, 1920.

5 SHEETS-SHEET 5- 3 L 69210 ZdLIz'o' UNITEDQSTATES ARNOLD KRIWAN; ornemnitnozar, NEAR BERLIN, GERMANY,

ROLLING-MILL WITH SUPPORTED WORKING ROLLS.

Specification of Letters Patent. Patent d N 30 19 Application filedDecember 28, 1916. Serial No. 139,404.

To all whom it may concern:

Be it known that I, ARNOLD KRIWAN, en-

gineer, a subject of the Emperor of Austria,

residing at 7 4 Schwerinstrasse, Mariendorf, near Berlin, in the GermanEmpire, have invented certain new and useful Improvements inRolling-Mills with Supported Working Rolls; and I do hereby declare thefollowing to be a full, clear,'and exact description of the invention.

.My invention relates more particularly to .that class of rolling millsfor the enlongation of material in which the working rolls aresupported.

In rolling mills which are chiefly used for the drawing out of thematerial to be rolled,

the diameter of the rolls should be as small as possible, becauseexperience has shown that rolls of small diameter produce greatelongation ofthe material to be rolled. These rolls of small diameter,however, show, under the counter-pressure of the material to-be rolled,a conslderable sagging or deflection and must therefore be supported.

' For this purpose it has previously been v proposed to adopt supportingrolls extending over the, entire length of the working rolls and runninginbearings in the housings; or supporting rails resting on the workingrolls and undergoing a shifting motion while the. rolls are revolving.The known supporting rolls are applicable only for plain working rolls,and not for rolls having various diameters on their longitudinal extent.In addition to this, there occur very strong pressures and frictionalstrains in the necks of the supporting rolls, so that special coolingarrangements have to be provided. 7

When making use of supporting rails, the working length is limited bythe length of the rails and, moreover, elaborate arrangements forsupporting and guiding the rails become necessary.

My invention has for its object to eliminate the defects of these knownarrangements and to provide for an effective cooling of the working.rolls. According to my invention ringsare used as supports for theworking rolls of small diameter, such rings revolving around fixed axlesheld by the housing frame, preferably by the insertion of balls orrollers between the rings and the axles. V

In the accompanying drawings I show'various forms of a rolling millconstructed in accordance with my invention.

Figure is a vertical longitudinal section of a two-high rollin m'll withfive difierent sizes of passes, and Iig. 2 is a front view of the samemill in which one of the frames is omitted.

F1g. 3 is asimilarview of a rolling mill with supportmg rings on bothsides of the worklng roll.

Figs. 4 and 5 are views of a three-high rolllng mill; Fig. 4* is adiagrammatic new indlcatlng the eccentric mounting of the rings b. F1gs. 6 and 7 are views showing details and Fig. 8 shows a rolling millwith a coolm arrangement A I eferring to the drawings a working roll aof small diameter is supported at the working portionsby rings 1), whichby the insertion of balls 0 or rollers, revolve freely on fixed axles dheld byZthe frame e.

The supporting rings 6 are of a very large diameter; in relation to thediameter of the working rolls a. The rolls and rings can revolvefreely,whereby a great savmg in I rso power is effected.

Instead of arranging the supporting rings 1n an exactly verticalposition above or below the working rolls, they may be arrangedlaterally in such a position as to receive the pressure on the workingroll and in a man-, ner similarto that already known in connec- .tion'with supporting rolls. By such an arrangement the tendency of theworking rolls to creep up theface of the supporting rings is revented.

f the rolling mill always works in one -directlon only, one "supportingring arranged laterally in such a position .as to receive the pressureon the roll or oneset of supporting rings for each workinglroll arrangedthis manner is suificient. f, however, the roll- 1ng m1ll worksalternately indifferent directlons, supporting rings can be arrangedonboth sides of the working froll'as shown- 'in Figs. 3and 4.

In a three-high rolling to support the central working roll by thecollars on the other working rolls. The central working roll is thussupported in a very el'ficient manner, even when the stress "is uneven-The stress becomes uneven on account of the fact that on thecommencement of the rolling process, only the first pass is occupied,while the other passes are only gradually occupied one after the other.The supporting rolls can be madenon-c'ircular in sectional form, so asto obtain varis r I I mill, it is possible easy to ous thicknesses inonepass. In this manner,

fashioned parts may be rolled.

As the position, which the supporting rings take with relation to theworking rolls must be exactly adjusted according to the work in handandbe altered if necessary, the normally fixed axles d of the supportingrings may be arranged in the housings in an adjustable manner.

Figs. 6 and 7 represent an example of such an adjusting arrangement. Theaxle d is laterally adjustable in its bearing part 7 by means of screwsg. The bearing part f which is guided at k may further assume adifferent position in height by a lateral shifting of 'the wedge piece1.

The veryconsiderable reduction in the diameter-of the working rolls inconsequence of the use of the supports described makes it possible tocool them from the inside, and further, as the pressure on the bearingsis very much reduced, to introduce a cooling liquid through the bearin sof the rolls. Hitherto, this was not possi 1e, as the cooling liquids inquestion could not be introduced into the'bearings in view of the highpressure on same and the high temperature.

Fig. 8 shows the cooling arrangement in which the cooling liquid is fedthrough pipe k intoan annular'space Z in the bearing m and then enters,through one or several holes in the neck, the From the bearing hand endof the liquid passes to the interior of the roll through the hole 1 andtravels lengthwise of the roll through passage n to the opposite endthereof at whichv point it passes out through hole l to the bearing atthis end and is led thence through pi ing Z to the bearing of the" rollabove. ere it enters through hole I the interior passage n of this rolland travels in opposite direction therethrough to the other end' of thisroll of one roll, e. g. the right where hole 1 communicates with thebearing above that of the lower roll at which the liquid enters throughpipe is. The liquid may be. led away through suitable piping,-possiblyconnected to a chamber communicating with the passage n On the righthand side of Fig. 8 the roll end is shown bored from its outer end. Theend opening of this bore will normally be closed by aplug to prevent theescape of cooling fluid. y? this arrangement, it is obtain such acirculation of the cooling liquid through the rolls, necks andb'earingsas will meet requirements, and thus obtain eflicient cooling.

Two or more rolls may be cooled in the manner described.

It has previously been ease of rolling mills, to cool the "rolls, theirhollow space n of the rollf lower roll in Fig. 8, the' from the upperroll proposed, in the necks and bearings. The known arrangements forinternal or external cooling, however, did not satisfactorily answer therequirements, as the feeding of the cooling liquid to the rolls andnecksunder great pressure did not assure a sufiicient cooling. Thesedefects have been eliminated in the arrangement above described.

I claim:

[1. In a rolling mill, a working roll and a 1 supporting ring therefor,said ring rotating on a fixed axis parallel ing roll.

to that of the workworkin said ring rotating that of the work- 2. In arolling mill, a supporting ring therefor, on a fixed axis parallel to,ing roll, together w1th anti-friction bearings between said ring andits fixed axis.

3. In a rolling mill, a plurality of stepped working rolls having aseries of passes'of diiferent dimensions, and cooperating supportingcollars on said rolls arranged between the passes.

4. In a rolling .mill, a plurality of stepped working rolls having aseries of passes of diflerent dimensions, and cooperating supportingcollars on said rolls arranged between the passes, together withsupporting rings rotating on fixed axes parallel to those ofthe rollsand bearing agalnst'the top and bottom working rolls, for the purposedescribed.

5. In a rolling mill having more than two stepped working rolls with aseries of passes ofdiflt'erent dimensions, a working roll having asupporting collar arranged between adjacent passes, and a cooperatingcollar on the adjacent intermediate roll.. I

6. In a rolling mill having more than two stepped working rolls with aseries of passes of different dimensions, a working roll having asupporting collar arranged between adjacent passes, and a cooperatingcollar on the adjacent intermediate roll, together with a supportingring bearing against said working roll'and rotating on a fixed axisparallel to-that of the working roll.

roll and a 7.,In a rolling mill having more than two stepped workingrolls with a series of passes of different dimensions, a working rollhaving a supporting collar arranged between adjacent passes, and acooperating collar on the adjacent intermediate roll, together with asupporting ring bearing against said work- .ing roll and rotating on afixed axis parallel

